Re: [PATCH] mm/gup: Fix memory leak in __gup_benchmark_ioctl

[John Hubbard <jhubbard@nvidia.com>]

On 12/11/19 9:46 AM, Navid Emamdoost wrote:
> In the implementation of __gup_benchmark_ioctl() the allocated pages
> should be released before returning in case of an invalid cmd. Release
> pages via kvfree().
> 
> Fixes: 714a3a1ebafe ("mm/gup_benchmark.c: add additional pinning methods")
> Signed-off-by: Navid Emamdoost <navid.emamdoost@gmail.com>
> ---
>  mm/gup_benchmark.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/gup_benchmark.c b/mm/gup_benchmark.c
> index 7dd602d7f8db..b160638f647e 100644
> --- a/mm/gup_benchmark.c
> +++ b/mm/gup_benchmark.c
> @@ -63,6 +63,7 @@ static int __gup_benchmark_ioctl(unsigned int cmd,
>  					    NULL);
>  			break;
>  		default:
> +			kvfree(pages);
>  			return -1;
>  		}
>  

Hi,

The patch is correct, but I would like to second Ira's request for a ret value,
and a "goto done" to use a single place to kvfree, if you don't mind. 

Either way, you can add:

Reviewed-by: John Hubbard <jhubbard@nvidia.com>

thanks,
-- 
John Hubbard
NVIDIA